A post submitted by CGI member Dave68.

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Today we live in a digital world where our mobile phones play an important role, regardless of age. This is why your mobile phone will be an indispensable thing when you need to communicate with people, even in the absence of internet and cellular service. All you need to have is a smartphone with a good-quality battery and a power bank to recharge it. Moreover, these days there are hundreds of mobile applications that can connect people with no internet access and even no connection at all. So, mobile phones can also be used for radio communication.

By Nancy Howard
January 2023

Tools that will help you stay connected

Let’s look at examples of messengers that can help you “stay connected” at all times. The majority of them can be installed on any operating system.

1.Bridgefy

A standalone messaging app that connects and communicates with smartphones from 100 meters or 330 feet (0.1 km) away using the built-in Bluetooth antenna. But the person must be on your contact list. You can send end-to-end encrypted messages to a single person, or create a group to communicate with several people at once. In this messenger, you can also share apps without an active internet connection or a user account. But verifying your phone number can speed up user detection.

The app also has a “Broadcast” feature, which is a great way to share information during large-scale events or meetings. It’s worth noting that despite the use of encryption tools, all messages that have been sent in broadcast mode will be displayed to users of the app who are nearby. However, it is worth remembering that in this case, your communication will not be private. Anyone can listen to it if they accidentally or intentionally get on the same frequency.

The advantage of this method is that you can be in touch with all participants of the dialogue at the same time. To organize such communication, you need to agree with subscribers on a dedicated channel (in simple words, frequency, or range) for communication. The frequency is chosen arbitrarily by subscribers. The range of such messengers varies from 60 to 100 meters and depends on possible interference since most often their work is based on Bluetooth technology (in the basement, the communication range can be reduced to several meters). Messengers need to be downloaded in advance, if there is stable access to the Internet, as well as to test their performance in advance.

2. Briar

Another free no-check phone number messaging app where no Wi-Fi connection is required. All you have to do is enter your name, and set a password, and you can write and send text messages without an internet or cellular connection. To add new contacts, you can scan the QR code on the other person’s device, which helps you avoid connecting with an unknown contact. In addition to messaging, the app allows you to create forums for questions as well as blog posts without leaving the app.

3. Rumble

An open-source application that positions itself as a fully self-contained microblogging app. Once you have installed the app via Wi-Fi or Bluetooth, Rumble allows users to freely chat and share images without using a cellular network.

More on link:

https://www.survivopedia.com/communication-plan-how-to-prepare-for-and-prevent-disaster/

https://prepper1cense.com/2025/07/06/6-tools-that-will-help-you-stay-connected-in-the-case-of-an-emergency/